Pi is an irrational number.

en.wikipedia.org/wiki/Proof_that_π_is_irrational

In the 18th century, Johann Heinrich Lambert proved that the number π (pi) is
irrational: that is, ... Then Lambert proved that if x is non-zero and rational then
this expression must be irrati...

www.quora.com/If-22-7-is-rational-why-is-pi-irrational

Because 22 7 isn't pi. The definition of an irrational number is that it cannot be
expressed as a ...

www.mathsisfun.com/irrational-numbers.html

You cannot write down a simple fraction that equals Pi. ... So you can tell if it is
Rational or Irrational by trying to write the number as a simple fraction.

math.stackexchange.com/questions/1179600/why-is-pi-considered-irrational-if-it-can-be-expressed-as-ratio-of-circumference

Mar 7, 2015 ... why is PI considered irrational if it can be expressed as ratio of circumference to
.... A real number is rational, if it is the ratio of two integers.

www.reference.com/math/pi-real-number-fcbfde230ea55ad2

Pi is a real number, as all numbers that exist on a number line are real. Real
numbers include all rational and irrational numbers; pi is defined as an irrational..
.

socratic.org/questions/is-pi-a-rational-irrational-number-natural-whole-or-integer

Jun 30, 2015 ... pi is an irrational number Rational numbers are all numbers expressible as p/q
for some integers p and q with q != 0. pi is not expressible as p/q ...

mindyourdecisions.com/blog/2013/11/08/proving-pi-is-irrational-a-step-by-step-guide-to-a-simple-proof/

Nov 8, 2013 ... You might remember the terms rational and irrational numbers from math ...
readers can directly check out several proofs that pi is irrational.

hubpages.com/education/forum/33827/how-is-pi-an-irrational-number-when-it-can-be-expressed-as-227

sunnyraghvendraposted 6 years ago. how is pi an irrational number when it can
be expressed as 22/7..... 22/7 is a rational number since it can be written in the ...

www.homeschoolmath.net/teaching/irrational_numbers.php

Most children learn about Pi and square roots somewhere during the middle ...
Well, irrational numbers are harder to understand than rational numbers, but I ...